BAS/ESP light
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From: Orange County CA.
BAS/ESP light
I have my BAS/ESP light on. I have tried the reset multiple times. There are no codes. Is there anyone that has actually resolved this issue?
I have read many suggested causes, but no one has actually posted how or if it was resolved. Everything seems to be functioning as normal.
I have read many suggested causes, but no one has actually posted how or if it was resolved. Everything seems to be functioning as normal.
Last edited by Valk; Dec 18, 2025 at 09:18 PM. Reason: spelling
Joined: Mar 2013
Posts: 200
Likes: 50
From: Mount Vernon Oh
Re: BAS/ESP light
I had the same problem , couldn't get the light to stay off. I replaced the brake pressure switch, 0015427518 . Did the reset with the steering wheel , light has been off for 3 years.
Joined: Jul 2024
Posts: 11
Likes: 3
From: Holly Springs, NC
Re: BAS/ESP light
UPDATE FIXED JAN 2025
Problem has been solved. I chased the issue for some time by myself, but it was really beyond my skillset. For someone that knows what they are doing-it took my mechanic who has worked on Mercedes for 14 years about 20 minutes. He used a multimeter and targeted the Brake Booster Sensor/Brake Booster Diaphram Position Sensor Part Number: 6500-08044460-info from Partsgeek.com (Chrysler Crossfire Service Manual calls the part "BAS Diaphram Travel Sensor"). He showed me that there was a possible voltage drop that seemed miniscule to me. I don't remember the #, but maybe it should have read 5 and it was 4.9. To me, that was close enough, but not in spec for him.
So the brake booster sensor came in to be replaced. (simple fix using a longer pick set) When he removed the brake booster sensor, it came out a littlle wet. Not knowing what I don't know, I would have just replaced it. He informed me that it should be DRY. So that meant that the master cylinder had leaked into the brake booster. So the brake master cylinder, brake booster and sensor had to be replaced. It has been fixed since January of 2025. The person who I purchased the car from, had a used/original brake booster from a parts car and mailed it to me saving me hundreds of dollars. (Mercedes may sell a new brake booster for $800?)..
Problem has been solved. I chased the issue for some time by myself, but it was really beyond my skillset. For someone that knows what they are doing-it took my mechanic who has worked on Mercedes for 14 years about 20 minutes. He used a multimeter and targeted the Brake Booster Sensor/Brake Booster Diaphram Position Sensor Part Number: 6500-08044460-info from Partsgeek.com (Chrysler Crossfire Service Manual calls the part "BAS Diaphram Travel Sensor"). He showed me that there was a possible voltage drop that seemed miniscule to me. I don't remember the #, but maybe it should have read 5 and it was 4.9. To me, that was close enough, but not in spec for him.
So the brake booster sensor came in to be replaced. (simple fix using a longer pick set) When he removed the brake booster sensor, it came out a littlle wet. Not knowing what I don't know, I would have just replaced it. He informed me that it should be DRY. So that meant that the master cylinder had leaked into the brake booster. So the brake master cylinder, brake booster and sensor had to be replaced. It has been fixed since January of 2025. The person who I purchased the car from, had a used/original brake booster from a parts car and mailed it to me saving me hundreds of dollars. (Mercedes may sell a new brake booster for $800?)..
Last edited by mikespine; Dec 19, 2025 at 09:51 PM.
Senior Member
Joined: May 2023
Posts: 2,973
Likes: 1,564
From: New Jersey
Re: BAS/ESP light
UPDATE FIXED JAN 2025
Problem has been solved. I chased the issue for some time by myself, but it was really beyond my skillset. For someone that knows what they are doing-it took my mechanic who has worked on Mercedes for 14 years about 20 minutes. He used a multimeter and targeted the Brake Booster Sensor/Brake Booster Diaphram Position Sensor Part Number: 6500-08044460-info from Partsgeek.com (Chrysler Crossfire Service Manual calls the part "BAS Diaphram Travel Sensor"). He showed me that there was a possible voltage drop that seemed miniscule to me. I don't remember the #, but maybe it should have read 5 and it was 4.9. To me, that was close enough, but not in spec for him.
So the brake booster sensor came in to be replaced. (simple fix using a longer pick set) When he removed the brake booster sensor, it came out a littlle wet. Not knowing what I don't know, I would have just replaced it. He informed me that it should be DRY. So that meant that the master cylinder had leaked into the brake booster. So the brake master cylinder, brake booster and sensor had to be replaced. It has been fixed since January of 2025. The person who I purchased the car from, had a used/original brake booster from a parts car and mailed it to me saving me a hundreds of dollars. (Mercedes may sell a new brake booster for $800?)..
Problem has been solved. I chased the issue for some time by myself, but it was really beyond my skillset. For someone that knows what they are doing-it took my mechanic who has worked on Mercedes for 14 years about 20 minutes. He used a multimeter and targeted the Brake Booster Sensor/Brake Booster Diaphram Position Sensor Part Number: 6500-08044460-info from Partsgeek.com (Chrysler Crossfire Service Manual calls the part "BAS Diaphram Travel Sensor"). He showed me that there was a possible voltage drop that seemed miniscule to me. I don't remember the #, but maybe it should have read 5 and it was 4.9. To me, that was close enough, but not in spec for him.
So the brake booster sensor came in to be replaced. (simple fix using a longer pick set) When he removed the brake booster sensor, it came out a littlle wet. Not knowing what I don't know, I would have just replaced it. He informed me that it should be DRY. So that meant that the master cylinder had leaked into the brake booster. So the brake master cylinder, brake booster and sensor had to be replaced. It has been fixed since January of 2025. The person who I purchased the car from, had a used/original brake booster from a parts car and mailed it to me saving me a hundreds of dollars. (Mercedes may sell a new brake booster for $800?)..
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